CAJ | 학술논문

气象业务的发展和社会需求的增长，对广域宽带网络系统提出更高要求，不但要求传输的数据量大，时效性强，而且要求其可靠性高。目前各省级气象局的宽带网可靠性设计，大都采用降级备份，无法做到双链路自动切换、无缝备份，难以满足气象业务7×24 h从不间断的实际需求，网络可靠性有待进一步提高。该文提出一种基于双向转发检测（BFD）和策略路由技术的网络可靠性设计方案，应用该方案不仅使网络结构和带宽有大幅提升，还能实现业务分流、链路冗余和故障自动切换，提高气象宽带网的可靠性水平。该方案经严格测试后，已依托广东省气象宽带网得以实现并投入业务运行，效果良好。同时，该设计对其他省级气象网络建设有一定参考价值。
기상업무적발전화사회수구적증장，대엄역관대망락계통제출경고요구，불단요구전수적수거량대，시효성강，이차요구기가고성고。목전각성급기상국적관대망가고성설계，대도채용강급비빈，무법주도쌍련로자동절환、무봉비빈，난이만족기상업무7×24 h종불간단적실제수구，망락가고성유대진일보제고。해문제출일충기우쌍향전발검측（BFD）화책략로유기술적망락가고성설계방안，응용해방안불부사망락결구화대관유대폭제승，환능실현업무분류、련로용여화고장자동절환，제고기상관대망적가고성수평。해방안경엄격측시후，이의탁광동성기상관대망득이실현병투입업무운행，효과량호。동시，해설계대기타성급기상망락건설유일정삼고개치。
With the rapid development of information technology,the demand of connectivity keeps rising and the scale of network keeps expanding.Design and implementation of a reliable wide-area-network are criti-cal for information transmission.With the development of meteorological services and growth of social needs,observations and forecast data gradually become larger and call for timeliness.Simple network in-frastructure is no longer a guarantee for reliable transmission and highly reliable network is desired,not only for mass data transmission,but also for higher reliability.At present,the reliability of broadband network at provincial level is normally realized by taking a downgrade backup.But the bandwidth of back-up link is narrow,so the transmission performance cannot catch up with the original link.Besides,it’s unable to switch links automatically,and manual intervention is still needed. <br> An original network reliability designing method is proposed based on BFD (bidirectional forwarding detection),NQA (network quality analysis)network reliability designing scheme,and strategy of routing technology.Through summarizing the network reliability research status,analyzing the meteorological broadband network reliability,the design and realization of this new meteorological broadband network is discussed from three aspects:The network backup,the flow sharing and the automatically switching.The application of the scheme has improved the network structure and bandwidth of the meteorological Prov-ince-City-County network system,and also has realized network backup,flow sharing and automatic switching on faults,which improves the reliability level greatly.There are 3 challenges in the design and implementation of this network.The first is the implementation of redundancy network with heterogene-ous transmission links,the second is the routing redundancy of physical link testing,and the last is the re-al-time switching at business level of task types.The scheme has been tested strictly and successfully im-plemented in meteorological broadband network of Guangdong Province,and it’s also suitable for meteor-ological network design of other provinces.